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Dome light staying on when doors are shut

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Old Apr 23, 2018 | 05:38 PM
  #1  
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Default Dome light staying on when doors are shut

I think I am having issues with my door switches. The dome lights will not shut off when i close all the doors. I believe the problem is with a passenger door because the key in ignition alarm shuts off when the drivers side door shuts. I can't figure this one out. Is there any way to test if it is a door switch?

Note: recently took terminal wires off my battery. Could that be causing an issue? Transmission control unit and audio amp are also detached for repairs.

Any thoughts?
 
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Old Apr 23, 2018 | 06:57 PM
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Are you sure your back cargo door is closed? That's typically when I have issues with the dome light. That or I bumped the 'on' button while moving something.
 
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Old Apr 23, 2018 | 07:43 PM
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I am positive. All the doors are closed. Even when I start the truck they stay on. Also, eventually they time out and shut off after a few minutes. Then they don't come on again when I open the door. They only come on when I turn the key on and off then remove it. Its confusing as hell. It seems like the truck just thinks the door is always open.
 
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Old Apr 23, 2018 | 08:12 PM
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Could be something electrical and it does sound as if your vehicle needs a good drying out. Rovers are odd, what can I say. I've learned to roll with the punches where my Rover is concerned because some days you feel like a nut.. some days you don't. Rover's got idio-sin-crazies.. BMWs don't

Hopefully it shuts off soon
 
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Old Apr 23, 2018 | 09:03 PM
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I know this sounds weird but... check your battery connections and cables. This happened to me before to include having to turn my lights on first which allowed me the start my truck. Really weird...
My positive cable worked it self loose from the positive cable terminal on the battery and had only 5 wire strands connected. I cut back the cable, recrimped on a new terminal and all has been well since then.
 

Last edited by JUKE179r; Apr 23, 2018 at 09:06 PM.
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Old Apr 23, 2018 | 09:09 PM
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Nothing sounds weird at this point! I will try anything to get this fixed. I want to see if the problem is solved once I re-attach the TCU and Amp. Maybe some sort of weird electrical thing is happening!
 
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Old Apr 23, 2018 | 09:45 PM
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It’s likely the multi function unit that is mounted on the rear of the fuse panel below the steering wheel. Among other things, it controls the timer for the overhead lights to fade out. Usually, there is a small hole that melts into the rear corner of that unit.
Some people have luck with resoldering the MFU inside, others buy used ones (7-10 bucks) at pick n pull. eBay ranges from 50-100 bucks usually. New from dealer they are near 400 bucks!
In my experience you will want to make sure that your drivers footwell and windshield bulkhead is 100% dry and not leaking water at all. Clean all the fuses- there are (3) related to the MFU. Lastly check your ignition switch and related harness. There are 3 parts to the tumbler harness- the 3 wire white plug goes directly into the fuse box, the brown 3 wire plug connects to the main harness under steering column. Lastly the black 4 wire plug attaches to the top of the ignition tumbler.
if you have checked all the door switches and established clean ground contacts at the frame and battery- you can sort through the above.
PM me if you need any help. I have been down this path a few times.
good luck!!
 
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Old Apr 23, 2018 | 09:54 PM
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The MFU was my next guess. I am bringing it in to have the transmission serviced and the diffs serviced soon. I think I'll have the guy poke around at the door latches to see if there are any bad switches. The MFU makes sense. However, if the case out is working and the only thing they aren't doing is shutting off when I lock the doors and turning on when I open them... could that still be an MFU problem?? Just curious.
 
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Old Apr 23, 2018 | 11:04 PM
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If you are handy and can follow through a list of elimination- I would suggest you follow this one on your own. Shops will charge a nightmare amount!
There is an interdependent relationship between the MFU, ignition switch, dome light switch and door sensor switches. When you add water corrosion and brittle wire/connectors to the mix- it’s not clear at 1st.
i started with the battery, ground cables and engine fuse block- cleaning and updating with new. Phase 2 was to clean all the relays in the pass footwell. Phase 3 was ignition switch and keys. Phase 4 was pulling out everything in drivers footwell and under steering wheel. I kept going in methodical order and spent an afternoon on each phase.
World of difference and the result is well beyond anything a the shop would have done for $150 an hour!
You will need an 8 mm socket for the driver fuse panel to remove 2 bolts. A flat blade screw driver, electrical tape and electric contact cleaner from Wurth. I iPhone for pictures at each step so I could reinstall. I opted for new fuses and relays, but at a min you will need (3) 10 amp red blade fuses for the 3 slots that support the MFU.
If you go after the igntion- you will need some zip ties, wire cutter and a hammer/chisel to work off the safety tabs on the steering column for ignition. A Phillips removes the plastic covers bottom screws.

 
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Old Apr 24, 2018 | 08:17 AM
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Originally Posted by mirrajumper
i started with the battery, ground cables and engine fuse block- cleaning and updating with new. Phase 2 was to clean all the relays in the pass footwell. Phase 3 was ignition switch and keys. Phase 4 was pulling out everything in drivers footwell and under steering wheel. I kept going in methodical order and spent an afternoon on each phase.
World of difference and the result is well beyond anything a the shop would have done for $150 an hour!
Great idea!
 
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